High-end games with multi-player integration, dozens of streaming options from a host of partners via XBox Live, a very simple user interface that never intends to be anything but pure entertainment.
It's not just one of the longest-serving releases at nearly 20 years old -- it's designed to be "pure" and cut back on customized apps, many graphical interface assistants and the requirement to download anything during the installation process.
Five years later, in version 3.0, it added an application programming interface (API) for its themes making it an effective platform for developing web applications as well as pure content sites.